CN103235628B - Power amplifier for communication power supply - Google Patents
Power amplifier for communication power supply Download PDFInfo
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- CN103235628B CN103235628B CN201310158133.7A CN201310158133A CN103235628B CN 103235628 B CN103235628 B CN 103235628B CN 201310158133 A CN201310158133 A CN 201310158133A CN 103235628 B CN103235628 B CN 103235628B
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Abstract
The present invention relates to power amplifier for communication power supply, digital control chip, low-pass filter and follower are sequentially connected in series to error amplifier negative input end, error amplifier negative input end connects voltage sample network, corrective network is connected with between the negative input end of error amplifier and output terminal, error amplifier output connects pulse-width modulator, follower output terminal connects the first resistance, first resistance is connected to the negative input end of error amplifier, one end of 3rd resistance is connected to error amplifier negative input end, the other end of the 3rd resistance is connected with the positive pole of diode, the minus earth of diode, described voltage sample network packet is containing the second resistance and the 4th resistance, and one end of the 4th resistance is connected to the negative input end of error amplifier, the other end ground connection of the 4th resistance, and one end of the second resistance is connected to the negative input end of error amplifier.For needing the circuit of temperature compensation, only need regulate two resistance values, the requirement that different temperatures compensates can be reached.
Description
Technical field
The present invention relates to a kind of power amplifier for communication power supply.
Background technology
At present, power amplifier for communication power supply is two-way out-put supply, and input is 48V, exports as mutual independently two-way DC voltage.Require that output voltage is by setting, scope, can not more than 240mV in full output area voltage fluctuation at 10V to 34V, because this is designed to low-cost design, chip used precision is not high, and temperature coefficient is poor, in different temperatures, different loads situation, this requires to be difficult to meet.Experimentally result, output voltage variation with temperature exports situation at 12V and is issued to 430mV, substantially exceeds designing requirement.
The temperature coefficient of current all parts determines the temperature variant size of output voltage jointly, and wherein the temperature coefficient of digital control chip, low-pass filter and follower is very large, and in 12V output situation, voltage varies with temperature very large.
Summary of the invention
The object of this invention is to provide a kind of power amplifier for communication power supply, solve output voltage within the scope of 10 ~ 40V, vary with temperature large problem, improve output voltage temperature coefficient.
Object of the present invention is achieved through the following technical solutions:
Power amplifier for communication power supply, comprise digital control chip, low-pass filter, follower and error amplifier, digital control chip, low-pass filter and follower are sequentially connected in series the negative input end to error amplifier, the negative input end of error amplifier connects voltage sample network, corrective network is connected with between the negative input end of error amplifier and output terminal, the output terminal of error amplifier connects pulse-width modulator, it is characterized in that: the output terminal of described follower connects the first resistance, first resistance is connected to the negative input end of error amplifier, one end of 3rd resistance is connected to the negative input end of error amplifier, the other end of the 3rd resistance is connected with the positive pole of diode, the minus earth of diode, described voltage sample network packet is containing the second resistance and the 4th resistance, and one end of the 4th resistance is connected to the negative input end of error amplifier, the other end ground connection of the 4th resistance, and one end of the second resistance is connected to the negative input end of error amplifier.
Further, above-mentioned power amplifier for communication power supply, wherein, described error amplifier is general-purpose operation amplifier.
The substantive distinguishing features that technical solution of the present invention is outstanding and significant progress are mainly reflected in:
Simple circuit of the present invention, cost is low, all can compensate in full output area, and effect clearly, and can be used for all circuit needing temperature compensation, only needs adjustment two resistance values, can reach the demand that different temperatures compensates.
Accompanying drawing explanation
Below in conjunction with accompanying drawing, technical solution of the present invention is described further:
Fig. 1: power amplifier for communication power circuit schematic diagram;
Fig. 2: output voltage initialization circuit schematic diagram.
Embodiment
As shown in Figure 1, power amplifier for communication power supply, comprise digital control chip 2, low-pass filter 3, follower 6 and error amplifier 9, digital control chip 2, low-pass filter 3 and follower 6 are connected to the negative input end of error amplifier 9 after connecting successively, the negative input end of error amplifier 9 connects voltage sample network 5, corrective network 4 is connected with between the negative input end of error amplifier 9 and output terminal, the positive input terminal of error amplifier 9 provides internal voltage reference 7, the output terminal of error amplifier 9 connects pulse-width modulator 1, the output driving power circuit of pulse-width modulator 1, as shown in Figure 2, the output terminal of follower 6 connects the first resistance 11, first resistance 11 is connected to the negative input end of error amplifier 9, one end of 3rd resistance 13 is connected to the negative input end of error amplifier 9, the other end of the 3rd resistance 13 is connected with the positive pole of diode 10, the minus earth of diode 10, voltage sample network 5 comprises the second resistance 12 and the 4th resistance 14, one end of 4th resistance 14 is connected to the negative input end of error amplifier 9, the other end ground connection of the 4th resistance 14, one end of second resistance 12 is connected to the negative input end of error amplifier 9, and the other end of the second resistance 12 provides output voltage 8.Wherein, error amplifier 9 is general-purpose operation amplifier.
Utilize the negative temperature coefficient feature of diode PN junction, the temperature coefficient of output voltage is diminished.The proportionate relationship of the 3rd resistance 13 and the 4th resistance 14 determines the degree corrected, and R3/R4 is less, and degree of correction is stronger, and R3/R4 is larger, and degree of correction is more weak; Within the scope of-40 degree ~ 85 degree, 12V exporting change reduces to 70mV from 430mV, meets design requirement completely.32V output voltage varies with temperature, and by adding negative being biased, the width of pwm signal is broadened, and such output voltage then reduces, and in whole temperature range, output voltage varies with temperature and is reduced into 150mV, meets design requirement completely.
In two-way out-put supply, output voltage varies with temperature and controls at below 240mV.First can regulate the ratio of the 3rd resistance 13 and the 4th resistance 14, make to vary with temperature from 10V to the output voltage of a certain output voltage range to reach requirement, then more than this output voltage, determine this output voltage values and temperature trip point, on this output voltage and on temperature, by adding a negative bias, strengthen pwm signal pulsewidth, to make output voltage reduce, reach and control the object that output voltage varies with temperature scope.
Simple circuit, cost is low, all can compensate in full output area, and effect clearly, and can be used for all circuit needing temperature compensation, only needs adjustment two resistance values, can reach the demand that different temperatures compensates.
It is to be understood that: the above is only the preferred embodiment of the present invention; for those skilled in the art; under the premise without departing from the principles of the invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (2)
1. power amplifier for communication power supply, comprise digital control chip, low-pass filter, follower and error amplifier, digital control chip, low-pass filter and follower are sequentially connected in series the negative input end to error amplifier, the negative input end of error amplifier connects voltage sample network, corrective network is connected with between the negative input end of error amplifier and output terminal, the positive input terminal of error amplifier provides internal voltage reference, the output terminal of error amplifier connects pulse-width modulator, the output driving power circuit of pulse-width modulator, it is characterized in that: the output terminal of described follower connects the first resistance, first resistance is connected to the negative input end of error amplifier, one end of 3rd resistance is connected to the negative input end of error amplifier, the other end of the 3rd resistance is connected with the positive pole of diode, the minus earth of diode, described voltage sample network packet is containing the second resistance and the 4th resistance, one end of 4th resistance is connected to the negative input end of error amplifier, the other end ground connection of the 4th resistance, one end of the second resistance is connected to the negative input end of error amplifier, and the other end of the second resistance provides output voltage.
2. power amplifier for communication power supply according to claim 1, is characterized in that: described error amplifier is general-purpose operation amplifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158133.7A CN103235628B (en) | 2013-05-02 | 2013-05-02 | Power amplifier for communication power supply |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310158133.7A CN103235628B (en) | 2013-05-02 | 2013-05-02 | Power amplifier for communication power supply |
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| Publication Number | Publication Date |
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| CN103235628A CN103235628A (en) | 2013-08-07 |
| CN103235628B true CN103235628B (en) | 2016-04-13 |
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| CN201310158133.7A Active CN103235628B (en) | 2013-05-02 | 2013-05-02 | Power amplifier for communication power supply |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6593864B1 (en) * | 2002-04-15 | 2003-07-15 | Optical Solutions, Inc. | Digital-to-analog converter with temperature compensation |
| CN1930772A (en) * | 2004-03-09 | 2007-03-14 | 诺基亚公司 | Temperature compensating circuit |
| CN102339083A (en) * | 2011-07-08 | 2012-02-01 | 北京物资学院 | Voltage-adjustable direct current voltage stabilizing power supply |
| CN202383103U (en) * | 2012-01-05 | 2012-08-15 | 苏州工业园区泰智测控技术有限公司 | Temperature drift compensating device of combustible gas sensor |
| CN102957314A (en) * | 2011-08-31 | 2013-03-06 | 艾默生网络能源有限公司 | Voltage reference source replacing method and switch power supply |
| CN203276082U (en) * | 2013-05-02 | 2013-11-06 | 安伏（苏州）汽车电源科技有限公司 | Power amplifier power supply for communication |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101162866A (en) * | 2006-10-09 | 2008-04-16 | 思柏科技股份有限公司 | Adjustable variant electric voltage voltage-stabilizing device |
-
2013
- 2013-05-02 CN CN201310158133.7A patent/CN103235628B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6593864B1 (en) * | 2002-04-15 | 2003-07-15 | Optical Solutions, Inc. | Digital-to-analog converter with temperature compensation |
| CN1930772A (en) * | 2004-03-09 | 2007-03-14 | 诺基亚公司 | Temperature compensating circuit |
| CN102339083A (en) * | 2011-07-08 | 2012-02-01 | 北京物资学院 | Voltage-adjustable direct current voltage stabilizing power supply |
| CN102957314A (en) * | 2011-08-31 | 2013-03-06 | 艾默生网络能源有限公司 | Voltage reference source replacing method and switch power supply |
| CN202383103U (en) * | 2012-01-05 | 2012-08-15 | 苏州工业园区泰智测控技术有限公司 | Temperature drift compensating device of combustible gas sensor |
| CN203276082U (en) * | 2013-05-02 | 2013-11-06 | 安伏（苏州）汽车电源科技有限公司 | Power amplifier power supply for communication |
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| CN103235628A (en) | 2013-08-07 |
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Effective date of registration: 20210928 Address after: Room 1903b, Bank of China Huilong building, No. 8, Suhua Road, Suzhou Industrial Park, Jiangsu 215000 Patentee after: Suzhou Industrial Park Siku Enterprise Management Service Co.,Ltd. Address before: 215021 No. 328, Xinghu street, park, Suzhou City, Jiangsu Province Patentee before: EFORE SUZHOU AUTOMOTIVE TECHNOLOGY Co.,Ltd. |